[llvm] [clang] [clang-tools-extra] [AMDGPU] Flip the default value of maybeAtomic. NFCI. (PR #75220)

[Jay Foad via cfe-commits]

================
@@ -29,6 +29,7 @@ class SM_Pseudo <string opName, dag outs, dag ins, string asmOps, list<dag> patt
   let mayStore = 0;
   let mayLoad = 1;
   let hasSideEffects = 0;
+  let maybeAtomic = 0;
----------------
jayfoad wrote:

#77443

https://github.com/llvm/llvm-project/pull/75220